Multiple-bit boring-machine.



PATENTED MAY 23, 1905.

J. M. GARFIELD. MULTIPLE BIT BORING MACHINE.

APPLICATION FILED DEC. 24, 1904.

uuen-roz NTTED STATES Patented May 23, 1905.

JOHN MORRIS GARFIELD, OF LOS ANGELES, CALIFORNIA.

MULTIPLE-BIT BORING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 790,823, dated. May 23,1905.

Application filed December 24:, 1904. Serial No. 238,245.

To (LZL whom it may concern:

Be it known that I, JOHN MORRIS GARFIELD, a citizen of the UnitedStates, residing at Los Angeles, in the county of Los Angeles and Stateof California, have invented new and useful Improvements in Multiple-BitBoring- Machines, of which the following is a specification.

My invention pertains to multiple-bit boring-machines, such as aredesigned more especially for use in making lock-mortises in doors; andit consists in the peculiar and advantageous construction hereinafterdescribed, and particularly pointed out in the claims appended.

In the accompanying drawings, forming part of this specification, Figure1 is a perspective view of the machine constituting the present andpreferred embodiment of my invention. Fig.- 2 is a transverse sectiontaken through the bit-carrying head of the machine. Fig. 3 is a detailsection taken in a plane at one side of the camlever. Fig. 4 is anenlarged detail section illustrative of the relative-arrangement of thebracket 25, the disk J, the gear K, and the shaft L.

Similar letters designate corresponding parts in all of the views of thedrawings, referring to which A is the main frame of the machine, whichmay be of wood or any other material suitable to the purposes of myinvention. The said main frame comprises an end wall a, side walls I),fixed to and extending at right angles from the end wall and havingopenings 0 and intermediate cross-bars d, extending across the saidopenings, a bar 6 fixedly connecting the walls I) at one side of theopenings 0, and a barf, fixedly connecting the walls I) at the oppositeside of the openings 0 and having lugs g on its outer side and alsohaving an opening it arranged between the lugs, as shown in Fig. 3. Thewalls I) of the main frame are also provided in their inner sides at oneside of the openings 0 with guideways i. In these guideways is arrangedand adapted to move an outwardly-directed flange j on a clamping-plateB, which is designed, in connection with the bar 6, to fix the machineon the edge of a door or the like.

The

plate B is engaged at its outer side and is adapted to be clampedagainst one side of a door by a cam-lever C, which is fulcrumed betweenthe lugs g on the bar f and is designed to work through the opening h,as illustrated.

D D are rectangular open frames disposed at the inner sides of the sidewalls I) of the main frame A.

E is a plate having reduced ends 7c loosely arranged in the open framesD and designed to guide the plurality of bits presently described andhold the said bits against lateral deflection while the same are inoperation.

F is a movable bit-carrying head, which preferably comprises lower andupper plates Z and m, held apart by spacing-bars n,and has reduced endsp loosely arranged in the open frames D.

G is a lever hinged at one end to one edge of the frame or head F andhaving a semicircular groove q in its inner side, which groove isthreaded and is designed, in connection with a threaded groove r in theedge of the said head F, to form a threaded bore.

' H is a suitable fastener designed to normally hold the lever G in theposition shown relative to the head F.

I is a feed-screw extending through the said threaded bore of the head Fand journaled in the end wall a of the main frame A and provided on itsouter end with a gear 8.

J is a rotatable disk arranged to turn in a bracket t on the frame-walla and having an angular aperture a.

K is a gear interposed between the bracket t and the frame-wall a andintermeshed with the gear 8 of the feed-screw I.

L is an endwise movable and rotatable shaft extending throu h theangular aperture a of the disk J and a similar aperture in the gear Kand journaled in the movable bitcarrying head F and terminating at itslower end in a bit 12.

M M are bits which in common with the bit 1) are loosely arranged in theguide-plate E and are j ournaled in the bit carrying head F.

N is a gear dis osed between the plates Z and m of the hea F and fixedon the shaft L, so as to derive rotary motion from the shaft L and movewith said shaft in the direction of the length thereof.

P P are gears keyed on the upper ends of the bits M and arranged betweenthe plates of the head F, and Q Q are pinions arranged in the head F andintermeshed with the gears N and P, as shown in Fig. 2.

In virtue of the gearing described it will be observed that when theshaft L is rotated through the medium of the crank to at its outer endor any other suitable means the bit '0 and thebits M will be rotated ina common direction, also that the feed-screw I will be turned and willmove the head F inwardly or outwardly, together with the several bits,according to the direction in which the shaft L is rotated. It will benoticed that the shaft L is free to move endwise incident to rotationthereof. The disk J bears and is adapted to turn with the shaft L in thebracket t, and yet said shaft is free to move in the direction of itslength through the said disk.

In virtue of the lever G being adapted to be swung away from thefeed-screw I it will be observed that after the several bits have beenturned into a door or the like the distance desired the removal of thebits from the door may be greatly facilitated, the same beingaccomplished by disengaging the said lever G from the screw I and thendrawing the bits out of the door through the medium of the shaft L.

In the practical operation of my improved machine the main frame A isfirst clamped on a door throu h the medium of the lever C and the platecoacting with the bar a of the mainframe. The several bits are thenturned and forced into the door through the medium of the rotary andendwise-movable shaft L and the feed-screw I. With this done the lever Gis disengaged from the feed-screw, and the several bits are withdrawnfrom the door through the medium of the shaft L.

It will be appreciated from the foregoing that through the medium of myimproved machine the several holes necessary in making alock-mortisemaybe expeditiouslybored with but a minimum amount of effort on the partof the operator, also that the machine is simple and compact inconstruction and is Well adapted to withstand the usage to which suchmachines are ordinarily subjected.

In order to enable the frames D to limit the depth of the holes to bebored by the several bits of the machine, I adjustably fix the saidframes D in the main frame A through the medium of set-screws R. Thesesetscrews when turned outwardly permit of the frames D being movedendwise in the main frame to the position desired and when turnedinwardly fix the said frames against movement with respect to the mainframe, and hence it follows that when the bit-carrying head F brings upagainst the loose plate E, which bears against the forward ends offrames D, which in turn bear against the edge of the door in which themortise'is to be formed, further forward movement of the bits will beprevented.

I have entered into a detailed description of the construction andrelative arrangement of the parts embraced in the present and preferredembodiment of my invention in order to impart a full, clear, and exactunderstanding of the said embodiment. I do not desire, however, to beunderstood as confining myself to such specific construction andrelative arrangement of parts, as such changes or modifications may bemade in practice as fairly fall within the scope of my invention asclaimed.

Having described my invention, what I claim, and desire to secure byLetters Patent, is

1. In a multiple-bit boring-machine, the combination of a main framecomprising an end wall and side walls fixed to and extending at rightangles from the end wall and having openings and intermediate cross-barsextending across said openings, means for fixing the main frame on adevice to be bored, open frames arranged at the inner sides of the sidewalls of the main frame and connected to said walls, a guide-plateloosely mounted in said open frames, a plurality of bits extendingloosely through the guideplate, a bit-carrying head movable in the openframes, means for rotating the several bits in concert, and means forfeeding the bitcarry ing head and the bits forwardly incident to therotation of the bits; the latter means being arranged to derive itsmotion from the means for rotatin the bits.

2. In a mutlipIe-bit boring-machine, the combination of a main framecomprising an end wall and side walls fixed to and extending at rightangles from the end wall and having openings and intermediate cross-barsextending across said openings, means for fixing the main frame on adevice to be bored, 0 en frames arranged at the inner sides of t e sidewalls of the main frame and connected to said walls, a guide-plateloosely mounted in said open frames, a plurality of bits extendingloosely through the guideplate, a bit-carrying head movable in the openframes, intermeshed gears fixed on the bits and carried by the head, abearing arranged on the end wall of the main frame and having a rotaryportion provided with an angular aperture, a shaft, of an ular form ineross-section, extending through said rotary portion, a gear keyed onthe shaft and interposed between the bearing and the end wall of themain frame, a feed-screw journaled in said end wall and having a gearintermeshed with that on the shaft, a lever hinged to the bit-carryinghead and having a threaded portion arranged to engage the feed-screw,and means for normally holding said lever with its threaded portion inengagement With the feed-screw.

3. In a multiple-bit boring-machine, the combination of a main framecomprising an end Wall and side Walls fixed to and extending at rightangles from the end Wall and having openings and intermediate crossbarsextending across said openings, a plate carried by the side Walls, atone side of the openings therein, and movable toward and from theportions of the side Walls at the opposite side of the openings, acam-lever mounted in the main frame and arranged to engage the movableplate, open frames arranged at the inner sides of the side Walls of themain frame and connected to said Walls,

nesses.

JOHN MORRIS GARFIELD. Witnesses:

JOHN BURNS, FRED SYKEs.

